/Engine/Plugins/Experimental/MeshModelingToolsetExp/Source/ModelingEditorUI/Public/ModelingWidgets/SToolInputAssetComboPanel.h
(Optional) set of collection-lists, if provided, button bar will be shown with each CollectionSet as an option
WidgetArgsType & CollectionSets &40; TArray< FNamedCollectionList > InArg &41;